The second piece of downloadable content has been outed by an Australian website. It will be called Escalation and will include five new levels - one of which might be a new zombie level.
The posted, which confirmed the name, has since been removed. However, it contained the follow map scenarios: "Seize the Zoo", "Take the Hotel", "Secure the Convoy", "Raid the Stockpile" and "Survive the Call of the Dead".
The poster also revealed that the map pack would arrive on the 5th of May, and that it would be initially exclusive on the Xbox 360 platform. No release date for the PC or PS3 was offered.